Honeywell Evohome

Until the invention of the smart thermostat, you probably only really thought about your thermostat when engaged in a battle of hotter/colder with the other inhabitants of your home, who clearly don’t care about bills/comfort. Now, thanks to connected thermostats you can control different rooms independently, ensuring that everyone gets a temperature they’re comfortable with, and that the bill-payer gets to save some pennies because only the rooms that are being used get heated.